package com.mihong.util;

/**
 * 16进制工具类
 * @date: 2019年3月4日
 */
public class HexUtil {

	/**
	 * 16进制字符串转byte数组
	 * @param hexString
	 * @return
	 */
	public static byte[] hexStringToBytes(String hexString) {   
        if (hexString == null || hexString.equals("")) {   
            return null;   
        }   
        hexString = hexString.toUpperCase();   
        int length = hexString.length() / 2;   
        char[] hexChars = hexString.toCharArray();   
        byte[] d = new byte[length];   
        for (int i = 0; i < length; i++) {   
            int pos = i * 2;   
            d[i] = (byte) (charToByte(hexChars[pos]) << 4 | charToByte(hexChars[pos + 1]));   
        }   
        return d;   
    }   
    
    private static byte charToByte(char c) {   
        return (byte) "0123456789ABCDEF".indexOf(c);   
    } 
	
    /**
     * byte转为16进制字符串
     * @param src
     * @return
     */
    public static String bytesToHexString(byte[] src){   
        StringBuilder stringBuilder = new StringBuilder("");   
        if (src == null || src.length <= 0) {   
            return null;   
        }   
        for (int i = 0; i < src.length; i++) {   
            int v = src[i] & 0xFF;   
            String hv = Integer.toHexString(v);   
            if (hv.length() < 2) {   
                stringBuilder.append(0);   
            }   
            stringBuilder.append(hv);   
        }   
        return stringBuilder.toString();   
    }

    /**
     * byte转为字符串
     * @param src
     * @return
     */
    public static String bytesToString(byte[] src){

        return null;
    }
}
